Wednesday, September 22, 2010

Redneck propane transfer and Eldorado disk mods

Filling the GMC LPG tank with a 20 pounder. It works by having a pressure difference caused by the sun heating the small tank and the GMC tank being relatively cooler. Inverting the small tank causes it to transfer liquid making it much faster than transferring vapor. This takes 5 to 20 minutes to happen. I tell when it is done by feeling how the weight changes on the small tank and if it feels like there is liquid still inside. Not sure it would work with the new style bbq tanks with the float deal in them.
Filling a 20 pounder from my bulk tank. Once again it transfers because of a temperature/pressure difference. I do it in the morning as the smaller tanks drop temperature overnight more than the bulk tank. I've put small tanks in a tub of cold water to get it to transfer too. Really cheap to fill the coach and bbq tanks this way. Installed a valve in the bulk tank bottom to get liquid out.
Chuck K had a couple of rear Eldorado disk brake backing plates to modify to fit his GMC. He had a spare spindle I used to get a good fit.
Basically the plates needed to be opened up and a chamfer put on the spindle hole to match the larger GMC spindle.

Thursday, September 16, 2010

Megasquirt MS3X expansion card installation

The loose board is a MS3X expansion card that has more I/O ports including 8 injector drive ports, 8 ignition ports and a cam position input. MS3 will run with out this adapter if you don't want the extra stuff. Additional I/O connects a female DB37 socket so I can't mix them up. Really like that the upgrades are add ons and I don't have buy all new stuff.

Sunday, September 12, 2010

Cadillac Seville HEI (350 Olds) and Tuner Studio tunes some more

This HEI distributor was on a 76 Cadillac Seville with a 350 Oldsmobile engine. Cadillac sold Sevilles with port fuel injection. They had semi sequential fueling and used a distributor like this that had two reed switches for injection timing. The box on the lower part of the housing contains the switches and flying magnets.

It had a 5 pin module with knock retard input on the extra pin. Used the old style mechanical and centrifugal advances.
The flying magnets are attached to the shaft with a roll pin. There is a plug on the other side of the box that can be removed to get the pin in and out. The reed switches are potted in the cover. They have a common connection, the switches close 180 degrees apart and have a narrow close time. This signal could be used for a cam position input for full sequential fueling.
Here is a screenshot of Tuner Studio's VE analyze after road tuning. The red cells changed a lot.